|
| year | production | consumption |
| 1980 | 15.00 | 225.00 |
| 1981 | | 212.00 |
| 1982 | | 209.00 |
| 1983 | 13.00 | 195.00 |
| 1984 | 12.00 | 167.00 |
| 1985 | | 152.00 |
| 1986 | | 158.75 |
| 1987 | | 188.45 |
| 1988 | | 195.60 |
| 1989 | | 229.40 |
| 1990 | 4.70 | 235.79 |
| 1991 | | 235.34 |
| 1992 | 8.05 | 259.63 |
| 1993 | 9.10 | 284.54 |
| 1994 | 6.10 | 302.58 |
| 1995 | 3.40 | 328.42 |
| 1996 | | 346.14 |
| 1997 | | 364.85 |
| 1998 | .79 | 381.36 |
| 1999 | .86 | 369.67 |
| 2000 | 1.14 | 352.77 |
| 2001 | 8.46 | 346.85 |
| 2002 | 9.85 | 337.75 |
| 2003 | 13.78 | 332.61 |
| 2004 | 25.00 | 337.22 |
| 2005 | 25.00 | 340.79 |
| 2006 | 25.00 | 332.47 |
| 2007 | 24.62 | 314.28 |
| 2008 | 24.55 | 300.23 |
| 2009 | 24.40 | 295.11 |
| 2010 | 32.95 | 309.25 |
| 2011 | 26.64 | 316.00 |
|
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